3-STAGE FILTRATION: The lv-h128 replacement filter has a three-stage filter design. The first pre-filter layer filters large particles such as pet hair and fur. The second H13 HEPA filter reduces 99.97% of dust, PM2.5 and dirt in the air. The third layer of activated carbon filters removes odours. A comfortable and safe environment for your children and familyREPLACEMENT CYCLE: The use of a new filter can improve the efficiency of your air purifier, thereby ensuring fresh and safe air in the room. It is recommended to replace the lv-h128 h13 filter every 6 months.EASY INSTALLATION: Get fresh air in a few steps1. remove the filter cover2. unwrap the new lv-128 filter3. place the filters into the air purifier4. replace the filter coverColour:blackMaterial:Filter cottonPackage Contents:4 Pack * HEPA Replacement FilterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.